v4 tests: useResolveEnsName

[ShravanSunder]

Use waffle / hardhat ens option as per their docks

Some Test cases

• make sure when ensName changes the hook updates
• tests to make sure that when provider changes it updates
• test with mock localstorage and if it has data or not
• • test if the hook fails gracefully when there are errors

this has some funky logic with window.localstorage. you need to mock window.